Dec 162017
 
Speed up your hard disk by changing the interleave factor.
File INTLEAVE.ZIP from The Programmer’s Corner in
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Speed up your hard disk by changing the interleave factor.
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Contents of the INTLEAVE.DOC file


INTLEAVE.DOC
Feb. 6, 1987


The following information was collected using a Compaq Deskpro with

an Adaptec 2010 controller, and a Seagate 20mb 80ms hard drive. I tested

different interleaves ranging from 6 to 2 to find out the optimum setting

for my system. Using the low level format built in my controller, FDISK,

FORMAT, and finally the CORE Disk Performance Test Program (Version 2.7),

I tested each interleave and came up with the following results:






INTERLEAVE


6 5 4 3 2

Data (kbytes Read): 340 408 510 680 340

Time (secs): 4.0 4.0 4.1 4.1 4.0

Data Transfer Rate (kb/sec): 84.3 100.9 123.3 162.1 84.3

Average Seek Time (ms): 84.7 84.7 83.8 83.8 84.7

Track-Track Seek(ms): 14.5 14.6 14.5 14.5 14.5

Performance Index: 1.151 1.250 1.390 1.621 1.151








As the table shows, an interleave of three is the optimum setting for

my machine. Since the optimum setting differs from system to system, It is

advisable that you run this series of tests on your machine. If you are as

much of a perfectionist as I, you can sacrifice about three hours to run the

tests and reinstall your software. I would like to thank Bob Schniebolk,

sysop of CONTECH BBS for the help he provided.


Evan Wagner

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Evan has done some really interesting work here, however, please note that his
results are applicable to his system. That is, if you repeat these tests for
your disk controller, your hard disk, and your system (BIOS), you will not
get the same results; however, when your tests are completed, you will have
optimized your hard disk to achieve its highest data transfer rate.

Notice, for Evan's system, there is a 2:1 difference in performance between
the data transfer rate at an interleave of 6 and that of 3. Notice also, that
if you are over-zealous and select too small an interleave, data access speed
is dramatically reduced. From the times between telephone calls, I estimate
the test series took about 4-5 hours. Well worth the effort, considering the
increased performance which Evan achieved.


Bob Schniebolk, Sysop CONECH BBS at 301-840-0227. Feb 7,1987.
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EOF INTLEAVE.DOC


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